As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU VIBRATED VIOLENTLY AFTER 15 MINUTES OF OPERATION AFTER ENG SHUTDOWN. APU AUTOSHUTDOWN. LARGE QTY OF SMOKE & SOME FLAMES VISIBLE FROM INTAKE. FIRE BOTTLE DISCHARGED. REMOVED AND REPLACED THE APU IAW G-450 MM 49-00-00. OPS AND LEAK CHECKED GOOD.